It's not quite as simple as that.
So the graphic card isnt much better than my GTX650Ti?
The PS3 has what is essentially a triple-core 3.2 GHz CPU with a top-end 256 MB NVIDIA GeForce 7-series (2005-06) video card and 256 MB XDR DRAM. If you have a PC with that hardware, you wouldn't be able to get anywhere near the graphics quality the PS3 has managed to push out.
Expect the same kind of thing to happen with the PS4.